题目内容
16.-Let's go for a picnic if it ________ tomorrow.-But nobody knows if it ________ tomorrow.( )
| A. | won't rain; rains | B. | doesn't rain; will rain | ||
| C. | doesn't rain; rains. | D. | won't rain; will rain |
分析 -如果明天不下雨,我们就去野餐.
-但是没人知道明天是否下雨.
解答 答案:B 根据Let's go for a picnic if it…可知,if引导的是条件状语从句,当主句是祈使句,从句应该用一般现在时态;又因为But nobody knows if it…可知,考查宾语从句,if引导的是宾语从句,表示"是否".当主句是一般现在时态,宾语从句应该根据需要选用任何时态.又因为tomorrow是表示将来的时间状语,所以从句应该用一般将来时态,故选B.
点评 本题考查宾语从句,做题时注意三要素时态、语序和引导词.本题先考虑语序问题,再根据句子的上下文的意思,做出选择.
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